North East Forum Moderator
Welcome along Ian. Firstly, well done for finding the FAQ's, most people don't even get that far!
Simply put, there is no solution. Thats a lie, there is, but you're not going to like it.
The radio you have installed changed in 2007 to this:
Looks great doesnt it?
Unfortunately though, it uses a different ariel system to what your A3 has installed... and since you dont want to change any of that, then its a no go. You also need to change some wiring as well for it to power up properly.
So you're stuck to having a radio pre-2007. Unfortunately though the only 'Double DIN' radios are the Symphony II and the RNS-E.
To anwer you question... without upgrading to the RNS-E and to eliminate the tape-deck, your only option is the Concert, but to even install that you need to get a single DIN cage, so even that seems then like its a no go...
Just get an RNS-E